Virtual ports can easily be broken by operating system upgrades, corrupted registry keys, or software updates. The symptoms of a PORTPROMPT: failure include: Microsoft print to pdf - Microsoft Q&A
Suddenly, his monitor flickered. A dialogue box appeared, but it wasn't the standard Windows UI. It was a black void with a single, blinking white cursor. “What do you wish to archive?” the prompt asked. microsoft print to pdf on portprompt
If you are looking at the tab in the properties window, you will see a port called PORTPROMPT: (Local Port). Do not uncheck this. This is the system-level port responsible for handling the file output. Changing this to an LPT or COM port will break the printer. The "Prompt" behavior is controlled by the checkbox in the Advanced tab as described above. Virtual ports can easily be broken by operating
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Print\Ports\PORTPROMPT: It was a black void with a single, blinking white cursor